Train stations in the UK sometimes broadcast mosquito noises that are so high-pitched they can only be heard by those under 25 years of age, but Japan's taken it one step too far with this age prediction gadget.

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Designed to be used on blind dates to determine their age, the Age Prediction Machine plays a buzzing mosquito sound, which will tell the user whether they're actually a teenager, in their early 20s, 30s or—heaven forbid!—over 40, depending on how well they can hear it. If they start slapping imaginary mosquitoes away on the 40-year old setting (which should be the loudest), then you know you've been set up with a goose of a blind date. [Plusd itmedia via Newlaunches]